A multivariate dataset (x1, x2, x3, x4, x5, y) of class matrix and dim 500 x 6 to be
fitted by a neural network with 5 hidden neurons (36 parameters).
Arguments
References
Friedman, J. H., Grosse, E., & Stuetzle, W. (1983). Multidimensional additive spline
approximation. SIAM Journal on Scientific and Statistical Computing, 4(2), 291-301.